

package com.hazelcast.internal.eviction.impl.comparator;

import com.hazelcast.internal.serialization.SerializableByConvention;
import com.hazelcast.spi.eviction.EvictableEntryView;
import com.hazelcast.spi.eviction.EvictionPolicyComparator;

/**
 * {@link com.hazelcast.config.EvictionPolicy#LRU}
 * policy based {@link EvictionPolicyComparator}.
 */
@SerializableByConvention
public class LRUEvictionPolicyComparator implements EvictionPolicyComparator<Object, Object, EvictableEntryView<Object, Object>> {

    public static final LRUEvictionPolicyComparator INSTANCE = new LRUEvictionPolicyComparator();

    @Override
    public int compare(EvictableEntryView e1, EvictableEntryView e2) {
        long time1 = Math.max(e1.getCreationTime(), e1.getLastAccessTime());
        long time2 = Math.max(e2.getCreationTime(), e2.getLastAccessTime());

        return Long.compare(time1, time2);
    }

    @Override
    public String toString() {
        return "LRUEvictionPolicyComparator{" + super.toString() + "} ";
    }

    @Override
    public final boolean equals(Object o) {
        if (o == null) {
            return false;
        }
        return getClass().equals(o.getClass());
    }

    @Override
    public final int hashCode() {
        return getClass().hashCode();
    }
}
